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Mesomechanical creep model of fly ash-contained cement mortar considering the interfacial transition zone and its influential factors
Highlights The thickness and viscoelasticity of ITZ are considered in the model. The model could well describe the creep behavior of mortar and verified by experiments. The ITZ can be characterized by the Burgers model. The ITZ’s thickness and viscoelastic parameter on the mortar creep are discussed. The aggregate’s volume fraction and fineness on the mortar creep are analyzed. The sensitivity of four factors is assessed and ranked based on the GRA theory.
Abstract A mesomechanical model was proposed to predict the creep behavior of cement mortar containing fly ash, with the Laplace transform principle applied. In this model, the mortar was regarded as a composite material, which is composed of the elastic fine aggregate phase, the viscoelastic cementitious paste phase, as well as the viscoelastic Interface transition zone (ITZ) phase between them. The generalized self-consistent Mori-Tanaka model in the Laplace transform domain was used as a base to establish the prediction creep model of mortar. The results showed that the proposed creep model of mortar considering the ITZ properly simulated the mortar creep behavior, with the coefficient of variation between the modeled and measured values locating in the range between 3% and 5%. Parameter analysis based on the grey relational analysis theory was conducted to clarify the key factors in this proposed model. Regarding the sensitivity of mortar creep to the factors, the decreasing order was as follows: ITZ viscoelastic parameter > ITZ thickness > fine aggregate volume fraction > the fineness of aggregate.
Mesomechanical creep model of fly ash-contained cement mortar considering the interfacial transition zone and its influential factors
Highlights The thickness and viscoelasticity of ITZ are considered in the model. The model could well describe the creep behavior of mortar and verified by experiments. The ITZ can be characterized by the Burgers model. The ITZ’s thickness and viscoelastic parameter on the mortar creep are discussed. The aggregate’s volume fraction and fineness on the mortar creep are analyzed. The sensitivity of four factors is assessed and ranked based on the GRA theory.
Abstract A mesomechanical model was proposed to predict the creep behavior of cement mortar containing fly ash, with the Laplace transform principle applied. In this model, the mortar was regarded as a composite material, which is composed of the elastic fine aggregate phase, the viscoelastic cementitious paste phase, as well as the viscoelastic Interface transition zone (ITZ) phase between them. The generalized self-consistent Mori-Tanaka model in the Laplace transform domain was used as a base to establish the prediction creep model of mortar. The results showed that the proposed creep model of mortar considering the ITZ properly simulated the mortar creep behavior, with the coefficient of variation between the modeled and measured values locating in the range between 3% and 5%. Parameter analysis based on the grey relational analysis theory was conducted to clarify the key factors in this proposed model. Regarding the sensitivity of mortar creep to the factors, the decreasing order was as follows: ITZ viscoelastic parameter > ITZ thickness > fine aggregate volume fraction > the fineness of aggregate.
Mesomechanical creep model of fly ash-contained cement mortar considering the interfacial transition zone and its influential factors
Xu, Zehua (author) / Zhao, Qingxin (author) / Guo, Weichao (author) / Zhang, Jinrui (author) / Tong, Jiannan (author)
2021-09-17
Article (Journal)
Electronic Resource
English
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